Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-07-21
Phys. Rev. A 75, 033812 (2007)
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 pages, 4 figures. Revised version with new figure 4 with localized states
Scientific paper
10.1103/PhysRevA.75.033812
Using a 3D Finite-Difference Time-Domain parallel code, we report on the linear and nonlinear propagation of light pulses in a disordered assembly of scatterers, whose spatial distribution is generated by a Molecular Dynamics code; refractive index dispersion is also taken into account. We calculate the static and dynamical diffusion constant of light, while considering a pulsed excitation. Our results are in quantitative agreement with reported experiments, also furnishing evidence of a non-exponential decay of the transmitted pulse in the linear regime and in the presence of localized modes. By using an high power excitation, we numerically demonstrate the ``modulational instability random laser'': at high peak input powers energy is transferred to localized states from the input pulse, via third-order nonlinearity and optical parametric amplification, and this process is signed by a power-dependent non-exponential time-decay of the transmitted pulse.
Angelani Luca
Conti Claudio
Ruocco Giancarlo
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